Testing Twine Wrap Actuator Current (Channel 018)

E52520-UN-26JUN03

A - COUNTER Key

B - EXTEND Key

C - RETRACT Key

Current overload protection to twine actuator is bypassed when using channel 018. Extended use of channel 018 may cause actuator damage.

Channel 018 allows operator use of EXTEND and RETRACT keys to position twine actuator for service.

This test is used to determine the working condition of the actuator through its entire range of operation.

To test actuator (motor and linkage):

1. Turn tractor key to ON position. Do not start tractor engine.

2. Press and hold COUNTER key (A) while turning monitor-controller ON.

3. Continue to hold COUNTER key and press PLUS key until CH018 appears in digital display.

4. Current flow readings shown on digital display are relative numbers, not indications of measurable units (amps).

   Release COUNTER key; digital display will change to show actuator static current flow reading of 0to 1.

5. Use EXTEND and RETRACT keys (B) and (C) to operate actuator in both directions. Display should show a current flow reading between 1 and 8 while actuator motor is operating during mid stroke (no load).

   • Below normal readings indicate low tractor voltage, or poor or corroded harness connections
   • Above normal readings indicate binding linkage or partially shorted motor windings
   • Current spike reading indicates mechanical obstruction to linkage
   
   

6. Continue to operate actuator to fully retracted position. Display should show stall (load) current reading between 22 and 30.

   • Below normal reading indicates bad or corroded harness connections
   • Above normal reading indicates partially shorted motor windings or actuator binding
   
   

7. Press EXTEND or RETRACT keys to move actuator to "home" position.

8. Turn monitor-controller OFF. Turn tractor key to OFF position. Remove key.